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Increasing efficiency of high numerical aperture metasurfaces using the grating averaging technique
One of the important advantages of optical metasurfaces over conventional diffractive optical elements is their capability to efficiently deflect light by large angles. However, metasurfaces are conventionally designed using approaches that are optimal for small deflection angles and their performan...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7188898/ https://www.ncbi.nlm.nih.gov/pubmed/32346135 http://dx.doi.org/10.1038/s41598-020-64198-8 |
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author | Arbabi, Amir Arbabi, Ehsan Mansouree, Mahdad Han, Seunghoon Kamali, Seyedeh Mahsa Horie, Yu Faraon, Andrei |
author_facet | Arbabi, Amir Arbabi, Ehsan Mansouree, Mahdad Han, Seunghoon Kamali, Seyedeh Mahsa Horie, Yu Faraon, Andrei |
author_sort | Arbabi, Amir |
collection | PubMed |
description | One of the important advantages of optical metasurfaces over conventional diffractive optical elements is their capability to efficiently deflect light by large angles. However, metasurfaces are conventionally designed using approaches that are optimal for small deflection angles and their performance for designing high numerical aperture devices is not well quantified. Here we introduce and apply a technique for the estimation of the efficiency of high numerical aperture metasurfaces. The technique is based on a particular coherent averaging of diffraction coefficients of periodic blazed gratings and can be used to compare the performance of different metasurface designs in implementing high numerical aperture devices. Unlike optimization-based methods that rely on full-wave simulations and are only practicable in designing small metasurfaces, the gradient averaging technique allows for the design of arbitrarily large metasurfaces. Using this technique, we identify an unconventional metasurface design and experimentally demonstrate a metalens with a numerical aperture of 0.78 and a measured focusing efficiency of 77%. The grating averaging is a versatile technique applicable to many types of gradient metasurfaces, thus enabling highly efficient metasurface components and systems. |
format | Online Article Text |
id | pubmed-7188898 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-71888982020-05-04 Increasing efficiency of high numerical aperture metasurfaces using the grating averaging technique Arbabi, Amir Arbabi, Ehsan Mansouree, Mahdad Han, Seunghoon Kamali, Seyedeh Mahsa Horie, Yu Faraon, Andrei Sci Rep Article One of the important advantages of optical metasurfaces over conventional diffractive optical elements is their capability to efficiently deflect light by large angles. However, metasurfaces are conventionally designed using approaches that are optimal for small deflection angles and their performance for designing high numerical aperture devices is not well quantified. Here we introduce and apply a technique for the estimation of the efficiency of high numerical aperture metasurfaces. The technique is based on a particular coherent averaging of diffraction coefficients of periodic blazed gratings and can be used to compare the performance of different metasurface designs in implementing high numerical aperture devices. Unlike optimization-based methods that rely on full-wave simulations and are only practicable in designing small metasurfaces, the gradient averaging technique allows for the design of arbitrarily large metasurfaces. Using this technique, we identify an unconventional metasurface design and experimentally demonstrate a metalens with a numerical aperture of 0.78 and a measured focusing efficiency of 77%. The grating averaging is a versatile technique applicable to many types of gradient metasurfaces, thus enabling highly efficient metasurface components and systems. Nature Publishing Group UK 2020-04-28 /pmc/articles/PMC7188898/ /pubmed/32346135 http://dx.doi.org/10.1038/s41598-020-64198-8 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Arbabi, Amir Arbabi, Ehsan Mansouree, Mahdad Han, Seunghoon Kamali, Seyedeh Mahsa Horie, Yu Faraon, Andrei Increasing efficiency of high numerical aperture metasurfaces using the grating averaging technique |
title | Increasing efficiency of high numerical aperture metasurfaces using the grating averaging technique |
title_full | Increasing efficiency of high numerical aperture metasurfaces using the grating averaging technique |
title_fullStr | Increasing efficiency of high numerical aperture metasurfaces using the grating averaging technique |
title_full_unstemmed | Increasing efficiency of high numerical aperture metasurfaces using the grating averaging technique |
title_short | Increasing efficiency of high numerical aperture metasurfaces using the grating averaging technique |
title_sort | increasing efficiency of high numerical aperture metasurfaces using the grating averaging technique |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7188898/ https://www.ncbi.nlm.nih.gov/pubmed/32346135 http://dx.doi.org/10.1038/s41598-020-64198-8 |
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